feat(sum.cpp): read two numbers and print their sum

[Helias]

Reads the numbers as double so decimals work too, e.g. 1.5 + 2.25 prints 3.75.

Summary by CodeRabbit

• New Features
  • Added a program that prompts for two numbers and displays their sum.

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🧰 Additional context used

📚 Code guidelines (1)

Generated by CodeRabbit — auto-discovered

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 351c3376-0f50-45a7-a4c1-9084e5bbc011

📥 Commits

Reviewing files that changed from the base of the PR and between 59cb25f and 8104991.

📒 Files selected for processing (1)

• exercises/sum.cpp

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📝 Walkthrough

Walkthrough

The change adds a main function that prompts for two double values, reads them, and prints their sum.

Changes

Sum Program

Layer / File(s)	Summary
Read values and print their sum exercises/sum.cpp	main prompts for and reads two double values, prints their sum, and returns 0.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 81049

The program handles the intended two-number sum flow, including decimal inputs; no actionable merge risk was identified.

Architecture Summary

Architecture risk: 🔵 Low · up to 81049

The change affects 1 system.

Changed systems: exercises

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — exercises (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in exercises/sum.cpp: Adds main, which prompts for and reads two double values, prints their sum, and returns 0.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: read two numbers and print their sum.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

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[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation correctly fulfills the documented exercise and supports decimal inputs.

Review effort: Balanced
Findings: None

What changed in this PR

Adds a standalone C++ exercise that reads two numbers and prints their sum.

Changes:

• Supports decimal inputs using double.
• Prompts for two values and displays their sum.

File	Description
exercises/​sum.cpp	Implements numeric input and sum output.

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